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• The words AND, OR and NOT may confuse the search; try adding quotes: "\"\\"((\\\"practice guidebook to ((statistical OR (statistical OR statistical)) OR ((statistical OR (statistical OR statistical)) OR (statistical OR (statistical OR statistical)))) and epidemiology.\\\") OR (\\\"practice guide to statistics and epidemiology.\\\"))\\"\"".
• Removing quotes may allow a broader search: ((\ practice guidebook to ((statistical OR (statistical OR statistical)) OR ((statistical OR (statistical OR statistical)) OR (statistical OR (statistical OR statistical)))) and epidemiology.\ ) OR (\ practice guide to statistics and epidemiology.\ )).